Which statement about microorganisms is true?
A. Bacteria and other microbes help purify the water we drink.
B. The majority of bacteria and fungi are toxic to humans.
C. Bacteria destroy more energy than they produce.
D. The "bacterial zoo" in our digestive systems has no known function.
E. The use of microorganisms to control plant diseases has not worked well.
Answer: A
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About 90% of the world's marine fish harvest takes place within
A) the international fishing waters. B) twelve miles of shore. C) coastal countries. D) the exclusive economic zone.
Which is not an example of a tropical cyclone?
A) Hurricane B) Nor'easter C) Willi-willi D) Typhoon
Which is an example of Steno's Law?
a. A microscopic crystal of garnet will have a different crystalline shape from a gemstone-grade crystal of garnet. b. The crystal faces of quartz, regardless of the size of the crystal, are always 120 degrees apart. c. Only large, well-developed minerals are crystalline. d. The polymorphs graphite and diamond have the same crystal shape. e. Fluorite, magnetite, and garnet have unit cells that are the same shape and therefore have the same crystal structure.
Downbursts from a thunderstorm ____
a. ?create high surface winds that extend in every direction from the center of the burst b. ?are a hazard to air traffic but dissipate before reaching the ground c. ?can only form from pockets of cold, dry air d. ?are most common on the trailing edge of a thundercloud e. ?are a wind effect that is not linked to rainfall